OEM Carrier Furnace Transformer 120V to 24V 40VA for Model UPFLOW100U48M19

This OEM Carrier transformer (part #HT01CN001) is the factory-specified control circuit transformer for the Carrier UPFLOW100U48M19 upflow gas furnace. The transformer steps down 120V line voltage to a safe 24V signal that powers every low-voltage control in your system — including the thermostat, gas valve relay, inducer relay, and ignition control board. When this part fails, the entire control circuit goes dark: the thermostat loses power, the furnace will not respond to any call for heat or cooling, and you may detect a faint burning smell or hear a buzz from the transformer body. Replacing it with the correct OEM unit restores full factory control circuit performance immediately.

• Specs: 120V primary | 12V/24V secondary | 40VA rating | Factory-matched winding tolerance | Replaces legacy part numbers HT01BJ115, 19EA41612, and 19EA42612
• OEM vs Generic: The OEM HT01CN001 is wound and potted to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers often sag under load, causing nuisance lockouts, thermostat brownouts, and shortened control board life.
• Install difficulty: 3/5 — Shut off power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts. Always photograph wiring connections before disconnecting the old transformer. Check low-voltage wiring for shorts before energizing — a shorted wire is the #1 cause of transformer burnout and will destroy a new unit instantly.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier UPFLOW100U48M19 upflow gas furnace. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.